Here’s some great news if your carrier of choice has the color magenta all over it, and you own either an HTC Amaze 4G or an HTC Sensation 4G.

Both those phones will be updated to Android 4.0 Ice Cream Sandwich at some point in the future. This information doesn’t come via a leak, but it’s officially straight from T-Mobile itself.

The carrier has updated its support documents for both the Amaze 4G and the Sensation 4G, and the newly revised documentation clearly mentions ICS updates, as you can see.

Unfortunately though, T-Mobile hasn’t publicized any other details about these updates yet. So we don’t have any indication of when they will become available. However, the support documents should be constantly updated as new information comes out, so we’ll keep an eye on them for you and let you know the instant there’s any news on the matter.

One thing looks pretty clear. HTC’s Sense 4.0 seems limited to smartphones that are shipping with Android 4.0 Ice Cream Sandwich right out of the gate. So the HTC One series has this new (and trimmed down) version of Sense. But older devices such as the Amaze 4G and Sensation 4G will probably just get Sense 3.6, which (as its version number suggests) is just an incremental update to the Gingerbread-based Sense 3.5. You can’t have it all apparently, since HTC is desperate to sell some new phones, especially after the rather rough times it faced last year.